Method and apparatus for transmitting uplink data in licensed-assisted access system

Abstract

A method and an apparatus for transmitting uplink data in a licensed-assisted access (LAA) system are provided. The method includes: receiving mode configuration indication information sent by a network device, where the mode configuration indication information is used to indicate that a synchronous hybrid automatic repeat request (HARQ) mode and an asynchronous HARQ mode are configured for uplink transmission of user equipment on an unlicensed carrier; and performing uplink transmission on the unlicensed carrier using the synchronous HARQ mode or the asynchronous HARQ mode and according to the mode configuration indication information.

What is claimed is: 
     
       1. A method comprising:
 receiving, by a terminal, mode configuration indication information sent by a network device, wherein the mode configuration indication information is used to indicate that a synchronous hybrid automatic repeat request (HARQ) mode and an asynchronous HARQ mode are configured for uplink transmission of the terminal on an unlicensed carrier; and 
 performing, by the terminal according to the mode configuration indication information, uplink transmission on the unlicensed carrier using the synchronous HARQ mode or the asynchronous HARQ mode, wherein the performing includes retransmitting, by the terminal, uplink data using the asynchronous HARQ mode when a needed resource has not been obtained through contention, wherein the needed resource is a resource that is on the unlicensed carrier and that is needed when the uplink data is retransmitted according to the synchronous HARQ mode; 
 wherein before retransmitting uplink data using the asynchronous HARQ mode, the method further comprises: 
 determining, by the terminal, to retransmit the uplink data using the asynchronous HARQ mode, when the needed resource has not been obtained through contention; and 
 sending, by the terminal, first indication information to the network device, wherein the first indication information is used to indicate that the terminal retransmits the uplink data using the asynchronous HARQ mode. 
 
     
     
       2. The method according to  claim 1 , wherein the mode configuration indication information is further used to indicate mode switching between the synchronous HARQ mode and the asynchronous HARQ mode. 
     
     
       3. The method according to  claim 1 , wherein the receiving mode configuration indication information sent by a network device comprises:
 receiving, by the terminal, a system message sent by the network device, wherein the system message carries the mode configuration indication information; or 
 receiving, by the terminal, radio resource control (RRC) signaling sent by the network device, wherein the RRC signaling carries the mode configuration indication information; or 
 receiving, by the terminal, downlink control information (DCI) sent by the network device, wherein the DCI carries the mode configuration indication information. 
 
     
     
       4. A method comprising:
 receiving, by a terminal, mode configuration indication information sent by a network device, wherein the mode configuration indication information is used to indicate that a synchronous hybrid automatic repeat request (HARQ) mode and an asynchronous HARQ mode are configured for uplink transmission of the terminal on an unlicensed carrier; and 
 performing, by the terminal according to the mode configuration indication information, uplink transmission on the unlicensed carrier using the synchronous HARQ mode or the asynchronous HARQ mode, wherein the performing includes retransmitting, by the terminal, uplink data using the asynchronous HARQ mode when a needed resource has not been obtained through contention, wherein the needed resource is a resource that is on the unlicensed carrier and that is needed when the uplink data is retransmitted according to the synchronous HARQ mode; 
 wherein before retransmitting uplink data using the asynchronous HARQ mode, the method further comprises: 
 receiving, by the terminal, second indication information that is sent by the network device when the network device determines that the needed resource has not been obtained through contention, wherein the second indication information is used to instruct the terminal to retransmit the uplink data using the asynchronous HARQ mode; and 
 determining, by the terminal according to the second indication information, to retransmit the uplink data using the asynchronous HARQ mode. 
 
     
     
       5. The method according to  claim 4 , wherein the second indication information is carried in downlink control information; and
 the second indication information comprises at least one of the following fields: a HARQ mode field or a HARQ mapping field, wherein the HARQ mode field is used to indicate that the synchronous HARQ mode or the asynchronous HARQ mode is used, and the HARQ mapping field is used to indicate a HARQ process number corresponding to the uplink data. 
 
     
     
       6. A method comprising:
 receiving, by a terminal, mode configuration indication information sent by a network device, wherein the mode configuration indication information is used to indicate that a synchronous hybrid automatic repeat request (HARQ) mode and an asynchronous HARQ mode are configured for uplink transmission of the terminal on an unlicensed carrier; 
 performing, by the terminal according to the mode configuration indication information, uplink transmission on the unlicensed carrier using the synchronous HARQ mode or the asynchronous HARQ mode, wherein the performing includes retransmitting, by the terminal, uplink data using the asynchronous HARQ mode when a needed resource has not been obtained through contention, wherein the needed resource is a resource that is on the unlicensed carrier and that is needed when the uplink data is retransmitted according to the synchronous HARQ mode; 
 receiving, by the terminal, third indication information sent by the network device, wherein the third indication information is used to indicate that the network device has not obtained the needed resource through contention; and 
 determining, by the terminal according to the third indication information, that the needed resource has not been obtained through contention. 
 
     
     
       7. A method comprising:
 receiving, by a terminal, mode configuration indication information sent by a network device, wherein the mode configuration indication information is used to indicate that a synchronous hybrid automatic repeat request (HARQ) mode and an asynchronous HARQ mode are configured for uplink transmission of the terminal on an unlicensed carrier; and 
 performing, by the terminal according to the mode configuration indication information, uplink transmission on the unlicensed carrier using the synchronous HARQ mode or the asynchronous HARQ mode, wherein the performing includes retransmitting, by the terminal, uplink data using the asynchronous HARQ mode when a needed resource has not been obtained through contention, wherein the needed resource is a resource that is on the unlicensed carrier and that is needed when the uplink data is retransmitted according to the synchronous HARQ mode; 
 wherein the retransmitting uplink data using the asynchronous HARQ mode when a needed resource has not been obtained through contention comprises: 
 retransmitting, by the terminal, the uplink data using the asynchronous HARQ mode when a percentage, in the needed resource, of a part that has not been obtained through contention in the needed resource exceeds a threshold; and 
 the method further comprises: 
 retransmitting, by the terminal, the uplink data using the synchronous HARQ mode when the percentage, in the needed resource, of the part that has not been obtained through contention in the needed resource is less than the threshold. 
 
     
     
       8. The method according to  claim 7 , wherein the retransmitting the uplink data using the synchronous HARQ mode when the percentage, in the needed resource, of the part that has not been obtained through contention in the needed resource is less than the threshold comprises:
 performing, by the terminal, puncturing processing on the uplink data according to the part that has not been obtained through contention in the needed resource, when the percentage, in the needed resource, of the part that has not been obtained through contention in the needed resource is less than the threshold. 
 
     
     
       9. A method comprising:
 determining, by a network device, to configure a synchronous hybrid automatic repeat request (HARQ) mode and an asynchronous HARQ mode for uplink transmission of a terminal on an unlicensed carrier; 
 sending, by the network device, mode configuration indication information to the terminal, wherein the mode configuration indication information is used to indicate that the synchronous HARQ mode and the asynchronous HARQ mode are configured for uplink transmission on the unlicensed carrier, to enable the terminal to preform uplink transmission on the unlicensed carrier using the synchronous HARQ mode or the asynchronous HARQ mode; and 
 determining, by the network device using the asynchronous HARQ mode, to receive uplink data that is retransmitted by the terminal on the unlicensed carrier; wherein the determining includes:
 receiving, by the network device, first indication information sent by the terminal, wherein the first indication information is used to indicate that the terminal retransmits the uplink data by using the asynchronous HARQ mode; and 
 determining, by the network device using the asynchronous HARQ mode, according to the first indication information, to receive the uplink data that is retransmitted by the terminal on the unlicensed carrier. 
 
 
     
     
       10. The method according to  claim 9 , wherein the sending mode configuration indication information to the terminal comprises:
 sending, by the network device, a system message to the terminal, wherein the system message carries the mode configuration indication information; or 
 sending, by the network device, radio resource control (RRC) signaling to the terminal, wherein the RRC signaling carries the mode configuration indication information; or 
 sending, by the network device, downlink control information (DCI) to the terminal, wherein the DCI carries the mode configuration indication information. 
 
     
     
       11. A method comprising:
 determining, by a network device, to configure a synchronous hybrid automatic repeat request (HARQ) mode and an asynchronous HARQ mode for uplink transmission of a terminal on an unlicensed carrier; 
 sending, by the network device, mode configuration indication information to the terminal, wherein the mode configuration indication information is used to indicate that the synchronous HARQ mode and the asynchronous HARQ mode are configured for uplink transmission on the unlicensed carrier, to enable the terminal to preform uplink transmission on the unlicensed carrier using the synchronous HARQ mode or the asynchronous HARQ mode; and 
 determining, by the network device using the asynchronous HARQ mode, to receive uplink data that is retransmitted by the terminal on the unlicensed carrier, wherein the determining to receive uplink data that is retransmitted by the terminal on the unlicensed carrier comprises: 
 determining, by the network device using the asynchronous HARQ mode, to receive the uplink data that is retransmitted by the terminal on the unlicensed carrier, when a needed resource has not been obtained through contention, wherein the needed resource is a resource that is on the unlicensed carrier and that is needed when the uplink data is retransmitted using the synchronous HARQ mode; and 
 the method further comprises: 
 sending, by the network device, second indication information to the terminal, wherein the second indication information is used to instruct to retransmit the uplink data using the asynchronous HARQ mode. 
 
     
     
       12. A terminal, comprising:
 a receiver; 
 a transmitter; 
 a processor; and 
 a memory, 
 wherein the receiver, the transmitter and the memory are coupled to the processor, 
 wherein the memory is configured to store computer executable instructions, and 
 wherein the receiver is configured to receive mode configuration indication information sent by a network device, wherein the mode configuration indication information is used to indicate that a synchronous hybrid automatic repeat request (HARQ) mode and an asynchronous HARQ mode are configured for uplink transmission of the terminal on an unlicensed carrier; and 
 wherein the processor is configured to perform uplink transmission on the unlicensed carrier using the synchronous HARQ mode or the asynchronous HARQ mode according to the mode configuration indication information; 
 wherein the processor is further configured to determine to retransmit the uplink data using the asynchronous HARQ mode, when the needed resource has not been obtained through contention; and 
 wherein the transmitter is configured to send first indication information to the network device, wherein the first indication information is used to indicate that the terminal retransmits the uplink data using the asynchronous HARQ mode. 
 
     
     
       13. The terminal according to  claim 12 , wherein the mode configuration indication information is further used to indicate mode switching between the synchronous HARQ mode and the asynchronous HARQ mode. 
     
     
       14. The terminal according to  claim 12 , wherein the receiver is further configured to:
 receive a system message sent by the network device, wherein the system message carries the mode configuration indication information; or 
 receive radio resource control (RRC) signaling sent by the network device, wherein the RRC signaling carries the mode configuration indication information; or 
 receive downlink control information (DCI) sent by the network device, wherein the DCI carries the mode configuration indication information. 
 
     
     
       15. The terminal according to  claim 12 , wherein the transmitter is configured to retransmit uplink data using the asynchronous HARQ mode when a needed resource has not been obtained through contention, wherein the needed resource is a resource that is on the unlicensed carrier and that is needed when the uplink data is retransmitted according to the synchronous HARQ mode.